Random Access Channel Message Without a Physical Downlink Control Channel

1. An apparatus for wireless communication at a user equipment (UE), the apparatus comprising: one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the UE to: transmit a first random access channel (RACH) message to a network entity; and monitor, absent downlink control information, for a second RACH message in a set of resource candidates based at least in part on the first RACH message.

2. The apparatus of claim 1, wherein, to monitor for the second RACH message, the one or more processors are configured to cause the UE to: monitor for the second RACH message in the set of resource candidates based at least in part on one or more of a RACH type, a preamble sequence subset of the first RACH message, RACH occasions, or a subset of RACH occasions.

3. The apparatus of claim 1, wherein the set of resource candidates are located in a physical downlink shared channel.

4. The apparatus of claim 1, wherein the second RACH message is scheduled via a remaining minimum system information message or another system information message.

5. The apparatus of claim 1, wherein the one or more processors are further configured to cause the UE to: receive, from the network entity, information that identifies the set of resource candidates.

6. The apparatus of claim 5, wherein, to receive the information that identifies the set of resource candidates, the one or more processors are configured to cause the UE to: receive the information that identifies the set of resource candidates in a remaining minimum system information message or in another system information message.

7. The apparatus of claim 1, wherein the one or more processors are further configured to cause the UE to: perform blind detection on one or more resource candidates of the set of resource candidates.

8. The apparatus of claim 1, wherein the one or more processors are further configured to cause the UE to: perform a cyclic redundancy check on one or more resource candidates of the set of resource candidates.

9. An apparatus for wireless communication at a network entity, comprising: one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the network entity to: receive a first random access channel (RACH) message; and transmit, based at least in part on the first RACH message, a second RACH message in a set of resource candidates scheduled absent downlink control information.

10. The apparatus of claim 9, wherein, to transmit the second RACH message, the one or more processors are further configured to cause the network entity to: transmit the second RACH message based at least in part on information in the first RACH message, and wherein the information indicates one or more of a RACH message type, a preamble sequence subset of the first RACH message, RACH occasions, or a subset of RACH occasions.

11. The apparatus of claim 9, wherein the set of resource candidates are located in a physical downlink shared channel.

12. The apparatus of claim 9, wherein the one or more processors are further configured to cause the network entity to: schedule the second RACH message via a remaining minimum system information message or another system information message.

13. The apparatus of claim 9, wherein, to transmit the second RACH message, the one or more processors are configured to cause the network entity to: transmit the second RACH message in the set of resource candidates based at least in part on a determination that a signal measurement satisfies a threshold.

14. The apparatus of claim 9, wherein the one or more processors are further configured to cause the network entity to: transmit a RACH configuration that indicates the second RACH message is to be transmitted in the set of resource candidates based at least in part on a RACH type, a preamble sequence subset of the first RACH message, RACH occasions, or a subset of RACH occasions associated with the first RACH message.

15. The apparatus of claim 14, wherein, to transmit the RACH configuration, the one or more processors are configured to cause the network entity to: transmit the RACH configuration in a remaining minimum system information message or in another system information message.

16. The apparatus of claim 9, wherein the one or more processors are further configured to: transmit information that identifies the set of resource candidates to a user equipment (UE).

17. A method of wireless communication performed at a user equipment (UE), comprising: transmitting a first random access channel (RACH) message to a network entity; and monitoring, absent downlink control information, for a second RACH message in a set of resource candidates based at least in part on the first RACH message.

18. The method of claim 17, wherein monitoring for the second RACH message comprises: monitoring for the second RACH message in the set of resource candidates based at least in part on one or more of a RACH type, a preamble sequence subset of the first RACH message, RACH occasions, or a subset of RACH occasions.

19. The method of claim 17, wherein the set of resource candidates are located in a physical downlink shared channel.

20. The method of claim 17, wherein the second RACH message is scheduled via a remaining minimum system information message or another system information message.

21. The method of claim 17, further comprising: receiving, from the network entity, information identifying the set of resource candidates.

22. The method of claim 21, wherein receiving the information identifying the set of resource candidates comprises: receiving the information identifying the set of resource candidates in a remaining minimum system information message or in another system information message.

23. The method of claim 17, further comprising: performing blind detection on one or more resource candidates of the set of resource candidates.

24. The method of claim 17, further comprising: performing a cyclic redundancy check on one or more resource candidates of the set of resource candidates.

25. A method of wireless communication performed at a network entity, comprising: receiving a first random access channel (RACH) message; and transmitting, based at least in part on the first RACH message, a second RACH message in a set of resource candidates that are scheduled absent downlink control information.

26. The method of claim 25, wherein transmitting the second RACH message comprises: transmitting the second RACH message based at least in part on information in the first RACH message, and wherein the information indicates one or more of a RACH message type, a preamble sequence subset of the first RACH message, RACH occasions, or a subset of RACH occasions.

27. The method of claim 25, wherein the set of resource candidates are located in a physical downlink shared channel.

28. The method of claim 25, further comprising: scheduling the second RACH message via a remaining minimum system information message or another system information message.

29. The method of claim 25, wherein transmitting the second RACH message comprises: transmitting the second RACH message in the set of resource candidates based at least in part on a determination that a signal measurement satisfies a threshold.

30. The method of claim 25, further comprising: transmitting a RACH configuration that indicates the second RACH message is to be transmitted in the set of resource candidates based at least in part on a RACH type, a preamble sequence subset of the first RACH message, RACH occasions, or a subset of RACH occasions associated with the first RACH message.

31. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising: one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to: transmit a first random access channel (RACH) message to a network entity; and monitor, absent downlink control information, for a second RACH message in a set of resource candidates based at least in part on the first RACH message.

32. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising: one or more instructions that, when executed by one or more processors of a network entity, cause the network entity to: receive a first random access channel (RACH) message; and transmit, based at least in part on the first RACH message, a second RACH message in a set of resource candidates scheduled absent downlink control information.